9729138 has 16 divisors (see below), whose sum is σ = 20304576. Its totient is φ = 3102000.

The previous prime is 9729131. The next prime is 9729143. The reversal of 9729138 is 8319279.

It is a super-2 number, since 2×9729138² = 189312252446088, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 9729096 and 9729105.

It is not an unprimeable number, because it can be changed into a prime (9729131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35113 + ... + 35388.

It is an arithmetic number, because the mean of its divisors is an integer number (1269036).

Almost surely, 2^9729138 is an apocalyptic number.

9729138 is an abundant number, since it is smaller than the sum of its proper divisors (10575438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9729138 is a wasteful number, since it uses less digits than its factorization.

9729138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70529.

The product of its digits is 27216, while the sum is 39.

The square root of 9729138 is about 3119.1566167796. The cubic root of 9729138 is about 213.4804556989.

The spelling of 9729138 in words is "nine million, seven hundred twenty-nine thousand, one hundred thirty-eight".